I ran into this while editing a team in League Manager. It will not allow me to add the permalink. It keeps the number(/lm-team/34/) instead of (/lm-team/midland-valley-high-school/) The Permalink works on one team only and not others.
Warning: call_user_func_array() expects parameter 1 to be a valid callback, class ‘MSTW_TR_TEAM_TAX_ADMIN’ does not have a method ‘add_team_metaboxes’ in /home/csraspor/public_html/wp-includes/class-wp-hook.php on line 286